Tert-carbinamine polyoxyalkylene surface-active agents



nire

This inventlon is concerned with tert.-carbinamirle l ox all-r'lene com ounds as new cornositions of mat- I) ter. in particular, these compounds, which are IlQD-IOIllC surface-active agents, are specir c amine-oxyethylene-oxypropylene compositions in which it is essential that the oxyethylene group be centrally positioned between the terminal amine and oxypropylene groups.

The compounds of this invention are mono or his compositions, or vari-proportioned mixtures thereof, which may be represented either by Formula I 1'21 2 i: (C2H-lO)u(C3 5 )b in which R R and R are alkyl groups whose total carbon content ranges from 7 to 23, a is an integer of from to 45, b is a number of from 15 to 67.5, and the relaion of bza is 1:1 to 1.521; or

Formula II (CZ e (CaHaO) all in which R R and R are the same as before, a-l-c equals an integer of from 15 to 45, b-l-d equals a number of from 15 to 67.5, and the relation of (b+d) (a+c) is 1:1 to 1.5:1.

In the his compound of Formula ii, a and c may be the same or unequal; b and [5 also may be the same or uneoual numbers. The preferred compositions, whether com rised of Formula I or Formula H, are those in which the sum of R R and R equals a total of from 11 to 14 arbor. atoms and a or (n+0) equals 2045 and b or (b-i-a) equals 45.

The novel co ipositions hereinabove defined are anhydrous light yellow liquids at room temperature, ha

rather low freezing points facilitates distribution thereof into cold alkaline base powders. They are extremely low foaming surfactants which are especially useful mechanical dishwashing applications. Their principal features are their abi- =.y to rinse soils from glassware and dishes so thoroughly that there is relatively little spotting the items so cleansed, and the ability to defoam aqueous dispersions containing proteinaccous and other types of foam-causing food soils such as eggs, flour, milk, etc.

Our novel compounds are prepared by the reaction of a tert.-carbinamine having the general structural formula vhere R R and R have the values given above with 1545 moles of ethylene odde, followed by reaction with 15-675 moles of propylene oxide. The reaction with ethylene oxi e is preferably carried out in two steps, the first in a Water-methanol solution from which is formed the monohydroxyethyl derivative rates Patent 0 or the bis(hydroxyethyl) derivative having the formula CH2OH20II R1R2RZCN OHzCHzOH or a mixture of the two possibly containing some unreacted primary amine.

When a mixture is obtained of the mono and bis(hydroxyethyl) derivatives, and some unreacted primary amine, the components may be separated and the mono and his derivatives reacted separately with additional ethylene oxide. lternatively, the crude reaction product may be reacted directly with additional ethylene oxidc. in either case, base catalysis is employed; and the 5. al mole ratio of ethylene oxide to amine is in the desired range of 15:1 to 45:1. This intermediate mixture is made up principally of tertiary amines of the structure RrRzRaCN (C2H40)bH However, if the initial reaction product contains a relatively high proportion of R R R CNHH CH OH, the product may largely consist of a single polyglycol chain having the structure R R R Cl lli(C I I O) ll. To either one of the above reaction products, propylene oxide is added and the reaction carried out with base catalysis so that the final product contains an average of 15-675 moles of propylene oxide per amino group. The resulting compositions have the structures of either Formula I or Formula 11 set forth above.

General information concerning the details of reacting the alkylene oxide with the tert.-carbinamine can be o tained by reference to US. Patent 2,871,266. However, some notable difierences exist between the process disclosed in that patent and the process by which the present compositions may be made. For example, the patent teaches a method of making only a polyoxyalkylene amine characterized by a monolinear chain of oxyalkylene groups. In the present development, the products are polyoxyalkylene amines which may have either a monolinear chain or dilinear chains of oxyalkylene units, or a mixture of the two. The reaction of the alkylene oxide Wlt'fi the tert.-carbinamine can be controlled to give predominantly single or double chain polyglycol derivatives, depending on the starting material and the concentration of the catalyst employed.

Another important distinction of the present invention over the prior art is the fact that the unique products herein disclosed are only obtainable when the ethylene oxide is added first. Addition of the propylene oxide first, or as a mixture with the ethylene oxide, leads to products which are much higher in foaming tendency, and possess substantially no defoaming ability in comparison with the products herelnbelow claimed.

Following are descriptions of various tests which were used to evzuuate the present compositions and which, by comparative evaluation with other surfactants known to the prior art, have proved the superiority of our novel products. The first is a method for testing the degree of foaming tendency; it has been named the Hamilton- Beach Foam Test and is performed essentially as follows.

The apparatus consists of a well-known Hamilton- Beach electrically driven mixing apparatus whi h is inserted into a glass tube (sealed at the bottom end). In the tube are four stainless steel bafile plates held vertical- 1y. The glass tube is immersed in a water bath which maintains the temperature Within 0.5 C. of the particular test temperatures (in this case, 50 C.). The mixer blades are centered in the tube with the upper blade /2 inch above the solution surface. The 200 ml. of 0.1%

Liv

test solution is equilibrated to temperature and then mixed at high speed (14,500 rpm.) for 3 minutes. The mixer is stopped and the foam height recorded after 15 seconds. A foam hei ht of less than 5.5 cm. is considered acceptable, and anything over that value is deemed unacceptable. Each test is usually run in duplicate.

The spotting test employed is of a type used throughout industry. It involves putting five clean l-onnce test drinking glasses an 10 load glasses through successive, complete cycles in a Kitchen Aid home-type of dishwasher. The glasses are placed on the top rack and the bottom rack is loaded with six 9-inch dinner plates smeared with a total of 60 grams of a standard soil (made from four parts of oleomargarine and one part of powdered milk). Eight unsoiled 6-inch salad plates are also placed on the bottom rack. All plates and glasses are maintained in specific positions from test to test. Forty grams of detergent formulation (0.45%) are added to each wash cycle minute wash and two l-minute rinses) with 2 /3 gallons of 250 ppm. hard water at 52- 57 C. followed by a 25-minute hot air drying period.

Evaluation of the results of the spotting test consists in counting spots more than /a inch in diameter, observing any haze or soil deposition, and noting over-all general appearance. The examination of the 5 test glasses is made under a fluorescent light source in a dark cabinet. The described procedure constitutes one cycle. Each detergent is tested for cycles (one run) using the same five glasses without additional cleaning between cycles. The test glasses are revolved a quarter turn and rotated one position in the rack after each cycle to insure equal treatment for each test glass. When care is exercised to maintain fairly uniform all variables such as the precleaning of glasses, water temperature, preparation or" soil, method of addition of detergent, etc., satisfactorily reproducible results are obtained. A detergent which leaves no more than 5 00 spots in this test after 10 cycles is considered satisfactory, and any larger number of spots would label the detergent as unsatisfactory. Also, a detergent which causes noticeable filming due to deposited soil or hard water salts is considered unsatisfactory. Normally, the material being tested is incorporated in an alkaline base which typically could be made up of about 35% sodium tripolyphosphate, 45% sodium metasilicate pentahydrate and soda ash.

The ability of surfactants to defoam food soils in another important requirement of surfactants which are primarily intended for use in apparatus for washing dishes and the like. The presence of any air in the Water spray employed in such machines reduces the mechanical emciency thereof by decreasing the impact of the spray on the substrates. A spray of lower force than that which the machine is designed to apply would not be as efiective in removing food particles. Serious foaming problems are caused by proteinaceous foods such as egg, milk, and flour, which cause relatively large quantities of air to be trapped in the water spray. At higher concentrations, team may also be caused by fatty or oily soils. The eifectiveness of a surfactant in minimizing the foam caused by food soils apparently depends upon the same characteristics which make those compositions highly useful in preventing spotting and filming on dishes and the like, because a rough correlation of the two with regard :to their effectiveness can be drawn quite readily.

The food soil defoaming test is performed with a dishwasher, such as the commercially well-known Kitchen Aid apparatus, in which the speed of the rotor is a function of the quantity and character of foam. Foam pumped into the rotor imparts less momentum to the rotor upon leaving than would water without air and hence the rotor moves slower.

The etergent containing the surfactant under test is added to the machine, and the machine is allowed to fill. When the spray begins, the machine is momentarily stopped, beaten whole fresh egg or other soil is added, and then the spray is allowed to continue. After 2, 3, and 4 minutes, the revolutions of the spray rotor are counted over a -second period. The reported rpm.

number is the average of these three determinations. For the prepared food soil whose composition is described in Table I below, this number must be at least 95 for the surfactant to be acceptable. For egg, flour and milk, is considered satisfactory at the specified concentrations of surfactant.

In Table I which follows, data is set forth which shows the performance of our novel compositions in the aforementioned foa-m and spotting tests and the test which measures the ability of surfactants to defoam food soils. All of the compositions above the horizontal dotted line,

a namely, compounds Nos. 1-11, are in accordance with Primarily monolinear structure.

b Primarily dilinear structure.

TABLE 1 Hamilton- Defoaming 01 food soils kitchen aid,

Beach r.p.m. at 5257 C. Surfactant composition ftoam Spotting test est, 0.1- Prepared 15 sec./ food Egg 2 Flour 2 Milk 3 0 0. soil 1 t-Amine 13151 15 0.0 101 46 45 47 Satisfactory. t-Atnlne l5 20- 0. O Do. t-Amine 3UP?!) D0. t-Alm'ne E15P20 DO. t-Amine EzoPgu Good. t-Aminc EzoPgu. D0. t-AlIllIle Enpggn D0. t-Amine E35Pz5 D0. t-Amine E35P 5l DO. t-Amine E35P5z.5 D0. t-Am ne E 51 Satisfactory. t-Am ne n 4P Unsatisfactory. t-Amrne E g. P g Satisfactory. t-Anune EeuPsumh 83 Unsatisfactory. t-AII11I18 P19E20 11. Q 1S E-P block copolymers 1. 0 58 28 39 40 Do.

I or II above (E oxyethylene and P =oxypropylv A commercial product made up of block co olymers of ethylene oxide and propylene oxide containing approximately 9 parts of mPmEs units and 1 part of zPsoEa.

base described in note above.

3 0.22% (20 gm.) dry milk, 0.30%

described in note above.

parts by weight of oleomargarine to 1 part by weight consisting of 2% surfactant and andalkahne base made up of so a as (27 gm.) or a. detergent consisting 011.25% surfactant and the alkaline (27 gm.) of a detergent consisting of 0.67% surfactant and the alkaline base the present invention as herein defined and claimed. All or" these compositions, it will be noted, proved acceptable in each of the said tests. By comparison, the compounds listed below the horizontal dotted line, namely, Nos. 12-15, are for one reason or another outside the "eachings of the present invention and they are all unsa 'sfactory. Compounds 12 and 13, for example, have oxyethylene and oxypropylene contents below the specified minimum. Correspondingly, the performance of com.- pound No. 12 has been unsatisfactory in the spotnng test and in its ability to defoam liquids containing er egg or the specia ly prepared rfood soil. Com ound No. 13 similarly has been unsatisfactory with regard to its defoaming ability, although it passes the spotting test. Corn-pound No. 14, which contains oxyethylene and oxypropylene in excess of the specified li s was unsatisfactory in the spotting test. Compound No. 15, in which the oxyprc-pylene is positioned centrally and the oxyethylene is one of the terminal groups, also performed unsatisfactorily, both in the Hamilton-Beach foam test and in the defoarning of egg test. Compare No. 16, which is representative of a well-known co-n nercial ethylene oxide-prop lene oxide surfactant hav'ng an oxypropylene group as the hydrophobic group; it behaved poorly in tne spotting and defoarning tests although it is acceptable from the standpoint of its low foaming tendency.

The tert.-carbinamines which may be used the preparation of -e present compounds are any of the can ruercialiy available N-tertiary alltyl amines having a total of 8 to 24 car They may be those which are non atoms. composed primarily of a single entity, or those which are mm'nly a mixture of isomers, homologs, or both. As typical exampres, there may be cited tert.-octy1 primary amine, 2-amino-2,4,4-trirnethylpentane, and a tert.-tridecyl u may amine, iso C HMC HQ CNH Also commerorally available are mixtures of tert.-alkyl primary anunes, SllCil 21S CIZE'IQJDIHZ 'tC C15H31NH2 and C1BH3TNH2 to C J-E NH these being derived from hydrocarbon fractions of such sizes. These tert-carbinamines may be represented by the formula Bi R (3NH;

in have the significance previously set forth. The smallest terL-ca binarnine reactant is an octyl amine and the la gest, a tetracosyl amine, as will be apparent to those skilled in the art.

The preparation of the polyoxyalliylated tertliyl amines of the present invention, which were gene .lly described above and illustrated by Formulas l and il,

l be more fully understood from the following illz.

ve examples, wherein parts by weignt are used a n in which n n and R Example In Five hundred grams of a commercial mixture of 12 carbon to li-carbon tert.-oarhinamines, containing mainly terL-C l-l Nl-l and having a neutral equivalent of 196, were charged to a 2-liter stainless steel autoclave equipped with a heater, a stirrer, a pressure gauge, and an inlet tube. A small cylinder for ethylene oxide was connected to the inlet tube through a valve.

One hundred fifty-eight grams of methanol and 46 g. of water were charged to the autoclave, which was then sealed. Stirring was started, and the temperature was raised to 80 C. The small cylinder was charged with 330 g. of ethylene oxide and connected to the inlet tube. The small cylinder was heated in a warmwater bath so as to maintain a gauge pressure of to 30 lbs./ sq. in.

The autoclave was vented once to remove air. The valve to the cylinder was then opened, allowing ethylene oxide to flow into the autoclave. The rate of ethylene oxide addition was adjusted so as to maintain a pressure in the autoclave of 10 to 20 lbs/sq. in. and a temperature of -*85 C. It was necessary to cool the autoclave during this addition. After 2 hours, all the ethylene oxide had been added. The valve to the cylinder was then closed, and heating at 80S C. was continued for 2 hours. At the end of this time, the autoclave was cooled to room temperature and vented to atmospheric pressure. The autoclave was opened and its contents transferred to a distillation flask. Methanol and water were removed at reduced pressure until no more distillate came over at a temperature of C. at an absolute pressure corresponding to 15 mm. of mercury. The product was then cooled to room temperature and filtered. it was a light amber oil weighting 825 g. The neutral equivalent was 253. This product was a mixture of the mono and bis-hydroxyethyl t-alkyl carbinamines.

Example Ib Example Ic The distillation in Example 1b was continued. After taking several intermediate cuts, a fraction boiling at 145 -150 C. at 0.1 mm. of Hg pressure was taken. This amounted to parts by weight and was substantially pure t-C I-I N(CH CH OH) Neutral equivalent was 278 (theory: 274) and refractive index (r2 was 1.4730.

Example 11 t-cis-iaHes-siNHEisPis Two hundred fifty-three parts (1 molar equivalent) of the product from Example a were mixed with 2.0 parts of flake sodium hydroxide and warmed to C. under N The appa atus was vented three times with nitrogen and a slow stream of ethylene oxide was passed in. Temperature was allowed to rise to ISO-180 C. When 603 parts of ethylene oxide had been taken up, as measured by weight gain, the flow of ethylene oxide was stopped, and addition of propylene oxide was begun. Addition of propylene oxide was continued at l50 C. until 870 parts had been taken up, as measured by weight gain.

The product was then cooled and the catalyst ne ralized by addition of 12.2 parts of 20% sulfuric acid. Product was stripped to remove water and was then filtered through a pad of diatomaceo-us earth. Product was a pale amber, water-soluble liquid. A 1% solution in water was clear *elow 24 C. but became turbid above this temperature.

Example III t-Cm-mlfis-srNHE-rslcars The procedure in ExamplelI was followed, except that 5.6 parts of potassium hydroxide was used as catalyst. The addition of ethylene oxide was continued until 1923 parts by weight of ethylene oxide had been taken up. The subsequent reaction of propylene oxide was continued until 3918 parts by weight of propylene oxide had been taken up. Neutralization was carried out with 9.8 parts of 50% H SQ The product had a cloud point of 25 C. at 1% in water.

Example IV t-Cm-mEs-atNHEmPzo The procedure of Example El was followed except that 23 8 parts of distilled product like that from Example lb was used. The weight of ethylene oxide added was 616 Starting with 278 parts of distilled material like that obtained in Example 10, the procedure of Example IV was followed. The resulting product was EaPb t-Ci2Hz5N EcPd in which a+c:16 and b+d=20.

Example VI t-C JSQiHST-NNHEELPSO Six hundred parts (2 molar parts by weight of analysis) of a commercial mixture of tert.-carbinamines in the 18 to 24 carbon range was mixed with 36 parts of water and 500 parts of isopropyl alcohol and treated with 106 parts (2.4 molar parts) of ethylene oxide in an autoclave as described in Example la. The product after stripping amounted to 700 parts by weight.

Seventy parts of the product (0.2 molar equivalents) and 0.8 part NaGH were reacted with 176 parts of ethylene oxide and 348 parts of propylene oxide by a procedure similar to that described in Example ll. uct gave a faintly hazy solution at temperatures below C. and was strongly turbid above 30 C.

Example VII EBPb bCsHuN A mixture of 600 parts of 2-amino-2,4,4-trimethylpentane, 80 parts of water, and 280 parts of methanol was treated with ethylene oxide as described in Example In until 368 parts had been absorbed. The product was then stripped to remove water and methanol and Was then distilled through a fractionating column.

The following fractions were collected:

principal use in mechanical :dishwashing described above, will suggest themselves to those skilled in the art. For example, in conjunction with alx'aline builders, the present compositions have proved effective in removing oil from steel surfaces. Because of their extremely low foam ing tendencies, this property makes the present invention particularly attractive for use in spray alkaline metal cleaning. Other areas of application include any operation where the general defoaming ability of these mate- 0 rials could be utilized to advantage, such as in connection with protein solutions, boiler feed water, solutions of other surfactants, resinous coating compositions, etc.

We claim:

1. A composition of matter having the formula in which R R and R are alkyl groups whose total carbon content ranges from 7 to 23, a is an integer of from 15 to 45, b is a number in the range of 15 to 67.5, and the relationship of bza is 1:1 to 15:1.

2. A composition of matter having the formula 3. A composition of matter having the formula in which R R and R are alkyl groups whose total carbon content ranges from 11 to 14, a is an integer of from 20 to 35, b is an integer of from 20 to 45, and the relation of bza is 1:1 to 15: 1. s

Neutral equivalent Fraction Compound Parts by Bolling weight range,

( OJmm.) Found Theory A t-C3H17NHCH2CH2OH 131 66-92/O.5 179 179 B t-CBH17N(CH2CHZOE)Z 796 l 122125/0.25 219 223 1483 parts of ethylene oxide, and 2610 parts of propylene 70 oxide. The resulting product was 1z 15 2s-31 H s5 which has a cloud point at 1% in water of 21.5 C.

Other uses for the present compositions, besides the 4. A composition of matter having the formula '11 )CZHl )n( B G )b RzC-N Rs (C2H4O)c(C HsO).1I-I

in which R R and R are alkyl groups whose total carbon content ranges from 11 to 14, a and c are any numhers whose sum equals an integer of from 20 to 35, and

b and d are any numbers whose sum equals an integer of from 20 to 45, and the relation (b+d):(a+c) is 1:1 to 1.521.

5. A composition of matter comprising a mixture of a first compound having the formula R1 R2 :NH(c2tno)..(C3Hto)b11 and a second compound having the formula R1 (O2 4 )a(C3 fiO)bH R2C N \(C2U40) 1; (03 50) dH in which R R and R are alkyl groups whose total carbon content in either compound ranges from 7 to 23, a in either compound is an integer in the range of 15 to 45, b in either compound is a number in the range of '15 to 67.5, the sum of a-I-c in the second compound equals an integer in the range of 15 to 45, the sum of b+d in the second compound equals a number in the range of 15 to 67.5, and the relation of bza in the first compound and the relation of (b+a):(a+c) in the second compound are 1:1 to 15:1.

6. The composition of claim 5 in which R R and R are 'alkyl groups whose total carbon content ranges from 11 to 14, a is an integer of from 20 to 35, b is an integer of from 20 to 45, the sum :of a+c is an integer of from 20 to 35, and the sum of b+d is an integer of from 20 to '45. 1

7. t-C H +1NH(C2H4O)15(C3H O)15H Where n is an integer from 12 to 15 inclusive.

8- t-C H NH(C H O) (C H O) H Where n is an integer from 12 to 15 inclusive.

9. t-C H +1NH(C2H4O)20(C3H5O) H Where n is an integer from 18 to 24 inclusive.

:10. Ft-C H2 +1NH(C/2H40)45'('C3HO)57 5H Where n (is an integer from 12 to 15 inclusive.

n 2n+1 2 4 )17.5( a 6 )22.5 ]2 Where is an integer from 12 to 15 inclusive.

13. t-C H2 NH(C2H4O)35(C3H O)H Where n is an integer from 12 to 15, inclusive.

References Cited in the file of this patent UNITED STATES PATENTS 2,673,882 Griffin Mar. 30, 1954 2,674,619 Lundsted Apr. 6, 1954 2,871,266 Riley Jan. 27, 1959 FOREIGN PATENTS 538,842 Canada Mar. 26, 1957 538,843 Canada May 26, 1957 754,679 Great Britain Aug. 8, 1956 

1. A COMPOSITION OF MATTER HAVING THE FORMULA 